I have collated the test results of many 2SJ74 devices that I have purchased from several sources. The Toshiba datasheet states that minimum gain for a 2SJ74 is 8 milli-Siemes. There is a range of Idss and gain for the 2SJ74 devices that I have measured. The Idss and gain were measured "cold". No warm-up period.
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I have collated the test results of many 2SJ74 devices that I have purchased from several sources. The Toshiba datasheet states that minimum gain for a 2SJ74 is 8 milli-Siemes. There is a range of Idss and gain for the 2SJ74 devices that I have measured. The Idss and gain were measured "cold".
No warm-up period. The cold Idss varied from 7mA up to The cold gain varied from 1 milli-Siemes to about 5 milli-Siemens. To me, the results indicate that all of these devices are fake 2SJ They appear to be real JFETs but are likely some lesser device that is easily obtained for cheap and intentionally marked to mislead. The lowest Idss devices have the lowest gain and the highest Idss devices have the highest gain. The number of device tested is well over devices.
They were tested on a keithley B running a script that measures Idss then the Vgs at current points above and below 5mA and at 5mA to extract gain above and below 5mA. Once the script is written, it is a rote exercise to test all of the parts. The most time consuming part is copying results to a text editor, printing the results and cutting up the paper to store with the device in a bag.
A faster solution would be to have a printer spit out the test results immediately after the test. Originally Posted by woofertester. Attached Files ToshibaFetscape. Originally Posted by NicMac. What are the applications for the highest grades versions with lowest Idss? Is that for amplifying very small signals like from MC pickups? Is there any Pass applications where this grade is the preferred?
Hello NicMac, do I read the link at the bottom of your messages correctly saying, that one can order from you devices per the list behind the link? May I make use of this oppoturnity? If so I guess, we can continue on this specific subject by mail separately not to bore the rest of the community.
Originally Posted by Zatopek. Find More Posts by Zen Mod. I measured Idss according to this scheme. On the example of one skbl: I measured Idss 5. Is my measurement correct? Attached Images jfet.
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Send a private message to Zatopek. Find More Posts by Zatopek. Quote: Originally Posted by Zatopek Hello NicMac, do I read the link at the bottom of your messages correctly saying, that one can order from you devices per the list behind the link? Send a private message to rif.
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2SJ74 DATASHEET PDF
Thanks for the tip Charlie! As a general rule how many JFets would one go through to get, say 20 pairs well matched? November 05, I will try to get a load of s before there all gone Not that the makes a poor line level device Common picks by professionals: Should be able to get really low noise and offset with these. The product line includes: Started by zebra50 The Lab.
2SJ74 MOSFET. Datasheet pdf. Equivalent